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Thanks. My FC before draining was roughly 12 or 13, because CYA was so high. Assuming I'm simply diluting, the FC should go to 6.5 and the CYA to 60 or 70 (I hope). If I understand correctly, the level will be perfectly ok and no shock. Of course, I'll test to be sure.

Had very high CYA and CH numbers due to Trichlor / CalHypo regimen. Water is otherwise spotless. SO, draining roughly half and refilling today / tomorrow with water from hose. And then moving to a liquid chlorine regime (maybe with some algeacide / clarifier as well since I have so much of...

Oh - I should add it's a vinyl liner.

HI - New guy here, with a 25k gallon pool in need of draining. (High CH and CYa). My estimate is that I need to drop it by 1/2. I'm told it's dangerous to drain, and I understand why. But I don't need to go all the way down. The bottom will always be covered by at least 6" of water. Of...